<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
   <style>
       * {
           margin: 0;
           padding: 0;
       }
       section {
           width: 100%;
           max-width: 980px;
           min-width: 320px;
           margin: 0 auto;
       }
       section div {
           float: left;
           width: 50%;
           height: 400px;
       }
       section div:nth-child(1) {
           background-color: pink;
       }
       section div:nth-child(2) {
           background-color: purple;
       }
   </style>
</head>
<body>
    <section>
        <div></div>
        <div></div>
    </section>
</body>
</html>